X²+20x+100=25-10x+x²
x²+20x+100-25+10x-x²=0
30x=-75
x=-75/30
x=-2,5
S=7²=49 площадь первого
S=9²=81 площадь второго
49+81=130 площадь двух
а²=130 площадь третьего
а=√130
<span>78 = 2 · 3 · 13;</span><span>117 = 3 · 3 · 13;</span><span>195 = 3 · 5 · 13;</span>НОД (78<span>; </span>117<span>; </span>195<span>) = </span>3 · 13<span> = </span><span>39;
</span><span>110 = 2 · 5 · 11;</span><span>154 = 2 · 7 · 11;</span><span>286 = 2 · 11 · 13;</span>НОД (110<span>; </span>154<span>; </span>286<span>) = </span>2 · 11<span> = </span><span>22;
</span><span>90 = 2 · 3 · 3 · 5;</span><span>126 = 2 · 3 · 3 · 7;</span><span>162 = 2 · 3 · 3 · 3 · 3.</span>НОД (90<span>; </span>126<span>; </span>162<span>) = </span>2 · 3 · 3<span> = </span><span>18</span>